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PARIS, FRANCE - JULY 03: Princess Madeleine of Sweden attends the Valentino show as part of Paris Fashion Week Haute-Couture Fall/Winter 2013-2014 at Hotel Salomon de Rothschild on July 3, 2013 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

Credit: Pascal Le Segretain

Princess Madeleine of Sweden and Christopher O'Neill depart their wedding ceremony at the royal palace on June 8, 2013, in Stockholm, Sweden.

Credit: Chris Jackson/Getty Images

Princess Madeleine of Sweden, left, speaks with Professor Shinya Yamanaka of Japan, laureate and Nobel Prize winner for medicine, during the Nobel Banquet after the 2012 Nobel Peace Prize Ceremony at Town Hall on Dec. 10, 2012, in Stockholm, Sweden.

Credit: Pascal Le Segretain/Getty Images

Christopher O'Neill and Princess Madeleine are seen here in this photo from the Swedish royal website.

Madeleine and her U.S.-British boyfriend Christopher O'Neill announced their engagement on the royal palace website on Oct. 25, 2012. Madeleine is the youngest of King Carl XVI Gustaf and Queen Silvia's three children and is fourth in line to the throne. The tabloid Expressen reported that O'Neill, a financier she met in New York, had proposed to the princess, and the couple confirmed the news in a brief video clip posted on the royal website.

Credit: Ewa-Marie Rundquist/Kungahuset.se

Princess Madeleine of Sweden attends the christening of new Swedish heir to the throne, Princess Estelle Silvia Ewa Mary of Sweden, at The Royal Palace on May 22, 2012, in Stockholm, Sweden.

Credit: Chris Jackson/Getty Images

Princess Madeleine of Sweden arrives at the American Scandinavian Society's 2011 Yule ball at the Metropolitan Club on Dec. 2, 2011, in New York.

Credit: Mike Coppola

Their Majesties King Carl XVI Gustaf of Sweden, center, and Queen Silvia of Sweden, right, pose for photographers with their daughter Princess Madeleine, left, as they arrive for the American-Scandinavian Foundation's Centennial Ball Friday Oct. 21, 2011, in New York.

Credit: Tina Fineberg/Getty

Princess Madeleine of Sweden attends the Gabrielle's Angel Foundation for Cancer Research "Angel Ball" honors gala at Cipriani's Wall St. in New York on Oct. 17, 2011.

Credit: AP

Princess Madeleine of Sweden and her brother, Prince Carl-Philip of Sweden, leave the Hotel Hermitage to attend a dinner at Opera terraces after the religious wedding ceremony of Prince Albert II and Princess Charlene of Monaco on July 2, 2011, in Monaco.

Credit: Getty Images

Princess Madeleine of Sweden arrives for the wedding of Prince Nikolaos and Miss Tatiana Blatnik at the Cathedral of Ayios Nikolaos on Aug. 25, 2010, in Spetses, Greece.

Credit: Chris Jackson/Getty Images

Princess Madeleine of Sweden and Queen Silvia of Sweden attend the wedding of Crown Princess Victoria of Sweden and Daniel Westling on June 19, 2010, in Stockholm.

Credit: Pascal Le Segretain/Getty Images

Princess Madeleine of Sweden attends the Wedding of Crown Princess Victoria of Sweden and Daniel Westling on June 19, 2010, in Stockholm, Sweden.

Credit: Pascal Le Segretain/Getty Images

Sweden's Princess Madeleine and her brother Prince Carl Philip arrive for a gala performance at the Stockholm Concert Hall in Stockholm on June 18, 2010, at the start of the weekend's wedding celebrations for their older sister, Crown Princess Victoria.

Credit: FRED DUFOUR/AFP/Getty Images

Princess Madeleine of Sweden, left, and actress Geena Davis listen to a speech by United Nations Secretary-General Ban Ki-moon during a conference called "Engaging Philanthropy to Promote Gender Equality and Women's Empowerment" at United Nations Headquarters in New York, Feb. 22, 2010.

Credit: AP Photo/Seth Wenig

Princess Madeleine of Sweden arrives with Oliver E. Williamson of the U.S., winner of the Sveriges Riksbank Prize in Economic Sciences, during the Nobel Foundation Prize Banquet 2009 at the Town Hall on Dec. 10, 2009, in Stockholm.

Credit: Pascal Le Segretain/Getty Images

Sweden's Princess Madeleine and her then fiance Jonas Bergstrom, are seen Aug. 11, 2009, during a press conference to announce their engagement at the Soliden palace in the island of Oland. The princess broke off the engagement a year later.

Credit: MAJA SUSLIN/AFP/Getty Images

The Swedish royal family, Queen Silvia, left, Princess Madeleine, second from left, King Carl XVI Gustaf, center, Prince Carl Philip, second from right, and Crown Princess Victoria, right, are seen during the Nobel Prize awards ceremony in Stockholm, Sweden, Dec. 10, 2008.

Credit: AP

Princess Victoria of Sweden, left, and Princess Madeleine of Sweden arrive to a concert and reception at the Nordic Museum in Stockholm on the second day of a three day state visit on April 16, 2008, in Stockholm.

Credit: Dan Kitwood/Getty Images

Princess Madeleine of Sweden talks to Swedish Prime Minister Fredrik Reinfeldt, left, as Nobel Prize in Physics winner Peter Grunberg of Germany looks on during the Nobel Foundation Prize 2007 Gala Dinner at the City Hall on Dec. 10, 2007, in Stockholm.

Credit: GETTY IMAGES/Pascal Le Segretain

Her Royal Highness Princess Madeleine of Sweden and Her Majesty Queen Silvia of Sweden attend the World Childhood Foundation USA Gala on Nov. 12, 2007, in New York.

Credit: GETTY

Princess Madeleine, Duchess of Halsingland and Gastrikland, attends the Swedish Embassy hosted reception for the Children First! Initiative Nov. 6, 2007, in Washington.

Credit: GETTY IMAGES/Nancy Ostertag

King Carl XVI Gustaf of Sweden, Queen Silvia of Sweden, center, and Princess Madeleine of Sweden attend the Crown Princess Victoria's birthday concert on July 14, 2007 in Borgholm, Sweden.

Credit: GETTY

Sweden's Prince Carl Philip and Princess Madeleine open the gate to the Royal Castle and invite the public in as part of national day celebrations in Stockholm, Sweden, June 6, 2007.

Credit: AP

King Carl XVI Gustaf, Queen Silvia, center, and Princess Madeleine of Sweden arrive for the spectator cruise to see the beginning of the next leg of the Volvo Ocean Race in New York, May 11, 2006.

Credit: AP Photo/Shiho Fukada

Princess Madeleine of Sweden arrives at the Winter Garden for the Volvo Ocean Race Gala Dinner in New York, May 11, 2006. The nautical formal gala benefits the World Childhood Foundation, founded by Sweden Queen Silvia in 1999.

Credit: AP

Princess Victoria of Sweden, Queen Silvia of Sweden, Princess Madeleine of Sweden and Princess Lilian of Sweden stand on the balcony during the changing of the guard on H.M. King Carl XVI Gustaf's 60th birthday at the Stockholm Royal Palace on April 30, 2006, in Stockholm.

Credit: GETTY IMAGES/Chris Jackson

Princess Madeleine and Prince Carl Philip of Sweden, are pictured on May 22, 2004.